用 sourcetree 建立两个远端， Github 成功，百度效率云失败

以下错误提示，看不懂...

git -c diff.mnemonicprefix=false -c core.quotepath=false push -v --tags --set-upstream baidu master:master
Pushing to https://[email protected]/git/sanfei/new
To https://[email protected]/git/sanfei/new
! [rejected] master -> master (non-fast-forward)



error: failed to push some refs to 'https://[email protected]/git/sanfei/new'
hint: Updates were rejected because the tip of your current branch is behind

hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

配置文件（ config ）
[core]
repositoryformatversion = 0
filemode = false
bare = false
logallrefupdates = true
symlinks = false
ignorecase = true
hideDotFiles = dotGitOnly
[remote "origin"]
url = https://github.com/省略
fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
remote = origin
merge = refs/heads/master
[remote "baidu"]
url = https://[email protected]/git/sanfei/new
fetch = +refs/heads/*:refs/remotes/baidu/*

之前为百度效率云建立一个远程的时候，成功了。
第一次搞两个远程，安全第一啊，两处有备份